Decorative film, carton, and method of making
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[0024]FIGS. 1A and 1B illustrate cross-sections of an aspheric conventional lens 16 and a Fresnel lens 17 having the same focal length. In general, positive focal length Fresnel lenses are almost universally planoconvex having a flat surface 18 and a jagged convex surface 19 as illustrated. A positive focal length Fresnel lens transforms the thicker aspheric lens into a much thinner lens having the same optical properties. In a Fresnel lens, the bulk of the material is reduced by the extraction of multiple coaxial annular cylinders 20 of material. The contour of the aspheric lens's convex surface 19 is thus approximated by right circular cylindrical portions intersected by conical portions having inclined surfaces 22. The inclined surfaces feel like multiple grooves when running your fingernail across the jagged convex surface 19. The height of the cylinders 20 do not contribute to the lens's optical properties enabling Fresnel lenses to be made extremely thin compared to the same f...
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